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United States Patent | 5,593,737 |
Meinzer ,   et al. | January 14, 1997 |
The present invention discloses a simplified method for coating a substrate with photocatalytic semiconductor by mixing photocatalytic semiconductor powder with water to form a mixture, reducing said pH of the mixture to below about 4, emulsifying the mixture, coating the substrate therewith, and illuminating the coated substrate with ultra-violet.
Inventors: | Meinzer; Richard A. (Glastonbury, CT); Birbara; Philip J. (Windsor Locks, CT) |
Assignee: | United Technologies Corporation (Hartford, CT) |
Appl. No.: | 448147 |
Filed: | May 23, 1995 |
Current U.S. Class: | 427/512; 204/157.3; 204/157.44; 427/553 |
Intern'l Class: | C08J 007/06; C03C 025/02 |
Field of Search: | 204/157.3,157.44,157.47,157.48 427/512,553 |
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4966665 | Oct., 1990 | Ibosuki et al. | 204/157. |
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5045288 | Sep., 1991 | Raupp et al. | 422/186. |
5078971 | Jan., 1992 | Matuda et al. | 422/121. |
5096745 | Mar., 1992 | Anderson et al. | 427/226. |
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Photocatalytic Purification and Treatment of Water and Air, 1993 Elsevier Science Published B.V., pp. 121-122, "Photocatalysis In Water Purification: Possibilities, Problems And Prospects", Ralph W. Matthews. Ibuski et al, Removal of Low Concentration Nitrogen Oxides through Photoassisted Catalysis Journal of Molecularal Catalysis 00 (1993) Elsevier Science Publishers Amsterdam. Peru et al, Development & Optimization of a TiO.sub.2 Coated Fiber Optic Cable Reactor: Photo Catalytic Degradation of 4 Chlorophenol. Environmental Engineering Science. W W Keck Laboratories California Institute of Technology Pasadena CA Jan. 1995. The First International Conference, 8-13 Nov. 1992, Cover Sheet, Table of Contents, pp. 1-9, "TiO.sub.2 Photocatalytic Purification And Treatment Of Water And Air". Ibid "Mechanism And By-Products Of The TiO.sub.2 Mediated Photo-Oxidation Of Trichloroethylene And Tetrachloroethylene In Aqueous Solutions", William H. Glaze, John F. Kenneke and John L. Ferry, pp. 39-40. Ibid "Application Of Thin Film TiO.sub.2 Photocatalyst: Lighting System With Deodorizing Function", Kazuhito Hashimoto and Akira Fujishima, pp. 190-191. Ibid "An Interior-Finishing Material With An Odor Control Function Coated By A Photocatalytic TiO.sub.2 Thin Film", Takatoshi Ogawa, Toshio Saito, Tamotsu Hasegawa, Hiroshi Shinozaki, Kazuito Hashimoto and Akira Fujishima, pp. 192-193. Ibid "Photocatalytic Activity Of TiO.sub.2 Thin Film Under Room Light", Toshiya Watanabe, Atushi Kitamura, Eiichi Kojima, Chiaki Nakayama, Kazuhito Hashimoto and Akira Fujishima, pp. 202-203. J. Phys. Chem., 1988, 92, pp. 5726-5731, "Kinetic Studies in Heterogeneous Photocatalysis. 1. Photocatalytic Degradation of Chlorinated Phenols in Aerated Aqueous Solutions over TiO.sub.2 Supported on a Glass Matrix", Hussain Al-Ekahi and Nick Serpone. J. Phys. Chem., 1984, 88, pages 1302-1307, "Optimization of Conditions for Photochemical Water Cleavage. Aqueous Pt/TiO.sub.2 (Anatase) Dispersions under Ultraviolet Light", J. Kiwi and M. Gratzel. Journal of Catalysis, 136, 1992, pp. 554-565, "Heterogeneous Photocatalytic Oxidation of Gas-Phase Organics for Air Purification: Acetone, 1-Butanol, Butyraldehyde, Formaldehyde, and m-Xylene Oxidation", Jose Peral and David F. Ollis. Photocatalytic Purification and Treatment of Water and Air, pp 121-122, "Photocatalysis In Water Purification: Possibilities, Problems And Prospects", Ralph W. Matthews. Materials Research Society Suymposium Proceedings, vol. 132, 8 pages, Nov. 30-Dec. 1, 1988, "Multicomponent Ultrafine Microstructure", L. E. McCandlish, D. E. Polk, R. W. Siegel, B. H. Kear. |